Analytical Sciences

Interferences Removal for Cadmium Determination in Samples with Complex Matrices by Hydride Generation Coupled with Non-dispersive Atomic Fluorescence Spectrometry

Zhongxi LI and Liping ZHOU

Northwest Geological Research Institute, No. 25, Xiying Road, 710054 Xi'an, China

An intermittent on-line concentration and separation system coupled with HG-AFS was developed to eliminate serious interferences from Cu²⁺, Pb²⁺ and Zn²⁺ on the determination of cadmium. In the present method, the interferences from common coexisting ions, such as Cu²⁺, Pb²⁺, Zn²⁺, Fe³⁺ and Ni²⁺, were greatly reduced. Under the optimized conditions, a detection limit of 3 pg ml^-1 (3 σ, n = 11) and a precision of 1.9% RSD for 1 ng ml^-1 of Cd were obtained. The method was successfully applied to the determination of cadmium in a series of Chinese Geological Reference Materials (SRMs) and GBW01621 ferronickel alloy using simple aqueous standard calibration technique. The results obtained were in good agreement with the certified values.

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